Split autocomplete component into separate composable components

[trevoreyre]

Instead of a single Autocomplete component, It would be better to separate the component into its individual parts, for easier overriding and styling.

<Autocomplete>
  <AutocompleteInput />
  <AutocompleteResults>
    <AutocompleteResult>Result 1</AutocompleteResult>
    <AutocompleteResult>Result 2</AutocompleteResult>
  </AutocompleteResults>
</Autocomplete>